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TABLE 1 HISTORICAL GROUNDWATER DATA Former Discovery Chevrolet 161511a`Street Tracy, California Well. No./ Date Total Depth to Groundwater Floating Chlorinated Elev.' Sampled Depths Waters Elevation Product TPHg Benzene Toluene Ethylbenzene Xylenes MTBE TPHd O&G Halocarbons (ft.) (ft.) (ft.) (ft.) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (Ppb) (Ppb) (Ppb) MW-3/ 09/16/94 19.5 10.49 35.10 ---- <50 <0.5 <0.5 <0.5 <0.5 na <50 10,00 na 45.59 03/08/95 19.5 10.65 34.94 ---- <50 <0.5 <0.5 <0.5 <0.5 na 200 <1,00 na 05/17/95 19.5 10.66 34.93 ---- <50 <0.5 <0.5 <0.5 <2 na <50 <1,00 na 08/07/95 19.5 11.53 34.06 ---- <50 <0.5 <0.5 <0.5 <0.5 na <50 <1,00 na 02/20/96 19.5 10.18 35.41 ---- <50 <0.5 <0.5 <0.5 <0.5 na 60 na nd 05/13/96 19.5 10.51 35.08 ---- <50 <0.5 <0.5 <0.5 <0.5 na <50 na nd 08/13/96 19.5 11.48 34.11 ---- na na na as na na 60 na nd 11/21/96 19.5 10.46 35.13 ---- na na na na na <5 <50 na nd 03/18/97 19.5 10.33 35.26 ---- <50 <0.5 <0.5 <0.5 <0.5 <5 <50 na na 06/12/97 19.5 10.58 35.01 ---- monitored only; groundwater sample not collected 09/17/97 19.5 10.72 34.87 ---- monitored only; groundwater sample not collected 12/18/97 19.5 10.42 35.17 ---- monitored only; groundwater sample not collected MW-4/ 04/04/97 20.0 10.75 34.81 ---- 415 1.1 0.5 10.9 35.5 na na na na 45.56 06/12/97 20.0 10.89 34.67 ---- <50 0.5 <0.5 2.0 .3.7 <5 na na na 09/17/97 20.0 11.06 34.50 ---- <50 <0.5 <0.5 <0.5 <0.5 <52 na na na 12/18/97 20.0 10.72 34.84 ---- <50 <0.5 <0.5 0.6 <2.0 <52 na na na MW-5/ 04/04/97 20.0 10.21 34.93 ---- <50 <0.5 <0.5 <0.5 <0.5 na na na na 45.14 06/17/97 20.0 10.40 34.74 ---- <50 <0.5 <0.5 <0.5 <0.5 <5 na na na 09/17/97 20.0 10.55 34.59 --- <50 <0.5 <0.5 <0.5 <0.5 <52 na na na 12/18/97 20.0 10.22 34.92 ---- <50 <0.5 <0.5 <0.5 <2.0 <52 na na na Trip Blank 06/12/97 ---- ---- ---- ---- <50 <0.5 <0.5 <0.5 <0.5 <5 na na na 09/17/97 ---- ---- ---- ---- <50 <0.5 <0.5' <0.5 <0.5 <5 na na na Refer to page 3 for Explanation. _ 8146.04-5 Page 2 of 3